Five decades on from The Ed Sullivan Show, the effect is still with us. The British Invasion may have started with the Beatles, but it certainly didn't end with them.
Parliament set up the Marshall Scholarships in 1953, with the express aim of extending the close ties between Britain and the United States that had developed during the Second World War. Marshall's "close accord" is, if anything, even more essential now.
Downton has clearly struck a nostalgic nerve on both sides of the Pond. Episodes of its third season have attracted British audiences of between 10 and 12 million -- about one in every six Brits.